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  Vue 响应式-发布订阅模式和观察者模式
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  <time datetime="2021-10-23T08:47:39.000Z" itemprop="datePublished">2021-10-23</time>
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  <p>Vue 通过数据与视图的双向绑定，实现了数据变化后视图的更新以及视图变化对应数据的更新操作。Vue 通过观察者模式实现了该特点。</p>
<span id="more"></span>

<h2 id="观察者模式"><a href="#观察者模式" class="headerlink" title="观察者模式"></a>观察者模式</h2><p>当数据发生变化后会通知所有依赖该数据的观察者，调用各观察者内部的 <code>update</code> 方法，实现观察者内部对数据变更的响应。其特点总结如下：</p>
<ol>
<li><code>Dep</code> (依赖项) 需要知道都有哪些 <code>watcher</code>(依赖者)；</li>
<li><code>Dep</code> 内部存在 <code>notify</code> 方法。当数据发生变化时，触发该方法，在方法内部调用所有 <code>watcher</code> 的 <code>update</code> 方法，实现响应；</li>
<li><code>watcher</code> 内部存在 <code>update</code> 方法。是对依赖数据发生变化后做出的响应函数；</li>
<li>观察者模式是松耦合，因为 <code>Dep</code> 需要知道存在哪些观察者。</li>
</ol>
<p>下面搞个示例具体看看以上特点。先给出 UML 类图：<br><img src="/2021/10/23/Vue-%E5%93%8D%E5%BA%94%E5%BC%8F-%E5%8F%91%E5%B8%83%E8%AE%A2%E9%98%85%E6%A8%A1%E5%BC%8F%E5%92%8C%E8%A7%82%E5%AF%9F%E8%80%85%E6%A8%A1%E5%BC%8F/UML.png" alt="UML 类图"></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// Dep 类</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Dep</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="title">constructor</span>(<span class="params">name</span>)</span> &#123;</span><br><span class="line">        <span class="built_in">this</span>.name = name;</span><br><span class="line">        <span class="built_in">this</span>.subs = [];</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="title">addSub</span>(<span class="params">sub</span>)</span> &#123;</span><br><span class="line">        <span class="keyword">if</span>(sub &amp;&amp; sub.update) &#123;</span><br><span class="line">            <span class="built_in">this</span>.subs.push(sub);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="title">notify</span>(<span class="params">value</span>)</span> &#123;</span><br><span class="line">        <span class="built_in">this</span>.subs.forEach(<span class="function"><span class="params">sub</span> =&gt;</span> &#123;</span><br><span class="line">            sub.update(value);</span><br><span class="line">        &#125;)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// Watch 类</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Watch</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="title">constructor</span>(<span class="params">name, scope</span>)</span> &#123;</span><br><span class="line">        <span class="built_in">this</span>.name = name;</span><br><span class="line">        <span class="built_in">this</span>.scope = scope;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="title">update</span>(<span class="params">value</span>)</span> &#123;</span><br><span class="line">        <span class="keyword">const</span> isNeed = <span class="built_in">this</span>.scope &lt; value;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">`<span class="subst">$&#123;<span class="built_in">this</span>.name&#125;</span>考试成绩<span class="subst">$&#123;<span class="built_in">this</span>.scope&#125;</span>, 所以<span class="subst">$&#123;isNeed ? <span class="string">&#x27;&#x27;</span> : <span class="string">&#x27;不&#x27;</span>&#125;</span>需要补考`</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 应用场景：班级周考结束，同学们根据语文老师发布及格线分数明确自己是否要进行补考。</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 假设班级一共有 3 个同学，小李，小花，小明，则每个同学相当于一个 watch 实例</span></span><br><span class="line"><span class="keyword">const</span> xiaoli = <span class="keyword">new</span> Watch(<span class="string">&#x27;小李&#x27;</span>, <span class="number">60</span>);</span><br><span class="line"><span class="keyword">const</span> xiaohua = <span class="keyword">new</span> Watch(<span class="string">&#x27;小花&#x27;</span>, <span class="number">80</span>);</span><br><span class="line"><span class="keyword">const</span> xiaoming = <span class="keyword">new</span> Watch(<span class="string">&#x27;小明&#x27;</span>, <span class="number">50</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 语文老师相当于一个 Dep 实例，需要知道班级里都有哪些学生</span></span><br><span class="line"><span class="keyword">const</span> dep = <span class="keyword">new</span> Dep(<span class="string">&#x27;语文老师&#x27;</span>);</span><br><span class="line">dep.addSub(xiaoli);</span><br><span class="line">dep.addSub(xiaohua);</span><br><span class="line">dep.addSub(xiaoming);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 老师通过一周的辛苦工作，终于可以告知同学 70 分以下是要进行补考的</span></span><br><span class="line">dep.notify(<span class="number">70</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 命令行执行文件后，运行结果如下：</span></span><br><span class="line"><span class="comment">// 小李考试成绩60, 所以需要补考</span></span><br><span class="line"><span class="comment">// 小花考试成绩80, 所以不需要补考</span></span><br><span class="line"><span class="comment">// 小明考试成绩50, 所以需要补考</span></span><br></pre></td></tr></table></figure>

<h2 id="发布订阅模式"><a href="#发布订阅模式" class="headerlink" title="发布订阅模式"></a>发布订阅模式</h2><p>发布订阅模式和观察者模式在行为上有一定的相似性，但是却是不同的两种设计模式。发布订阅模式的特点如下：</p>
<ol>
<li>发布者和订阅者之间不需互相知道</li>
<li>发布者和订阅者之间通过中间层消息代理帮助通信</li>
</ol>
<p>发布订阅模式的应用也很常见，例如：<code>js 中的事件监听</code>。</p>
<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>上个图来总结下两种设计模式之间的差异：<br><img src="/2021/10/23/Vue-%E5%93%8D%E5%BA%94%E5%BC%8F-%E5%8F%91%E5%B8%83%E8%AE%A2%E9%98%85%E6%A8%A1%E5%BC%8F%E5%92%8C%E8%A7%82%E5%AF%9F%E8%80%85%E6%A8%A1%E5%BC%8F/comp.png" alt="比较"></p>
 
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        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
                    let src = $em2.getAttribute('data-target') || $em2.getAttribute('src')
                    let title = $em2.getAttribute('alt')
                    // 获得原图尺寸
                    const image = new Image()
                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
    viewer_init()
</script> 
<!-- MathJax -->

<!-- Katex -->

<!-- busuanzi  -->

<!-- ClickLove -->

<!-- ClickBoom1 -->

<!-- ClickBoom2 -->

<!-- CodeCopy -->
 
<link rel="stylesheet" href="/css/clipboard.css">
 <script src="https://cdn.jsdelivr.net/npm/clipboard@2/dist/clipboard.min.js"></script>
<script>
  function wait(callback, seconds) {
    var timelag = null;
    timelag = window.setTimeout(callback, seconds);
  }
  !function (e, t, a) {
    var initCopyCode = function(){
      var copyHtml = '';
      copyHtml += '<button class="btn-copy" data-clipboard-snippet="">';
      copyHtml += '<i class="ri-file-copy-2-line"></i><span>COPY</span>';
      copyHtml += '</button>';
      $(".highlight .code pre").before(copyHtml);
      $(".article pre code").before(copyHtml);
      var clipboard = new ClipboardJS('.btn-copy', {
        target: function(trigger) {
          return trigger.nextElementSibling;
        }
      });
      clipboard.on('success', function(e) {
        let $btn = $(e.trigger);
        $btn.addClass('copied');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-checkbox-circle-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPIED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-checkbox-circle-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
      clipboard.on('error', function(e) {
        e.clearSelection();
        let $btn = $(e.trigger);
        $btn.addClass('copy-failed');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-time-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPY FAILED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-time-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
    }
    initCopyCode();
  }(window, document);
</script>
 
<!-- CanvasBackground -->

<script>
  if (window.mermaid) {
    mermaid.initialize({ theme: "forest" });
  }
</script>


    
    

  </div>
</body>

</html>